pcntl_wexitstatus
Description
int pcntl_wexitstatus ( int status )Returns the return code of a terminated child. This function is only useful if pcntl_wifexited() returned TRUE.
status 参数是提供给成功调用的 pcntl_waitpid() 函数的状态参数。
See also pcntl_waitpid() and pcntl_wifexited().